US2025107316A1PendingUtilityA1
Light-emitting device, illumination device, image display device, and indicator lamp for vehicle
Est. expiryDec 27, 2042(~16.4 yrs left)· nominal 20-yr term from priority
H10K 50/12F21S 43/14C09K 11/0883C09K 11/77346F21Y 2115/10F21V 9/38F21S 41/125F21S 41/176F21S 41/141F21K 9/60H10H 20/851G02B 5/20F21W 2103/45F21W 2103/35F21W 2103/20F21W 2103/15F21W 2102/30F21W 2102/00F21K 9/64
65
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Claims
Abstract
The present invention relates to a light-emitting device including a first luminescent material and a second luminescent material which emits visible light by irradiation with light from the first luminescent material, in which the second luminescent material contains at least a red phosphor which satisfies the following (A) and (B): (A) An emission spectrum has at least one emission peak having a full width at half maximum (FWHM) of 20 nm or more and 65 nm or less, and (B) Chromaticity coordinates of a light emission color are present between two straight lines represented by the following equation (a) and equation (b) based on coordinates represented by (x, y) in a CIE 1931 chromaticity coordinate system: (a) y=0.992−x, (b) y=1.000−x, and 0.290≤y≤0.350, an illumination device, an image display device, and an indicator lamp for a vehicle.
Claims
exact text as granted — not AI-modified1 . A light-emitting device comprising:
a first luminescent material; and a second luminescent material which emits visible light by irradiation with light from the first luminescent material, wherein the second luminescent material contains at least a red phosphor which satisfies the following (A) and (B): (A) an emission spectrum has at least one emission peak having a full width at half maximum (FWHM) of 20 nm or more and 65 nm or less, and (B) chromaticity coordinates of a light emission color are present between two straight lines represented by the following equation (a) and equation (b) based on coordinates represented by (x, y) in a CIE 1931 chromaticity coordinate system:
y
=
0
.992
-
x
,
(
a
)
y
=
1.
-
x
,
and
(
b
)
0.29
≤
y
≤
0
.
3
5
0
.
2 . The light-emitting device according to claim 1 , wherein a value of y of chromaticity coordinates of red light emitted by the red phosphor is 0.300 or more.
3 . The light-emitting device according to claim 1 , wherein the value of y of the chromaticity coordinates of the red light emitted by the red phosphor is 0.310 or less.
4 . The light-emitting device according to claim 1 , wherein the red phosphor comprises a phosphor which does not substantially include Mn.
5 . The light-emitting device according to claim 1 , wherein the emission spectrum of the red phosphor comprises at least one emission peak having an emission peak wavelength of 648 nm or less.
6 . The light-emitting device according to claim 1 , wherein internal quantum efficiency of the red phosphor is 30% or more.
7 . The light-emitting device according to claim 1 , wherein the red phosphor has the full width at half maximum in the emission spectrum of 57 nm or less.
8 . The light-emitting device according to claim 1 , wherein the red phosphor has an emission peak wavelength x (nm) and a full width at half maximum y (nm) in the emission spectrum satisfying a relationship: y≤184−0.2x.
9 . The light-emitting device according to claim 1 , wherein the red phosphor comprises at least a phosphor containing a crystal phase having a composition represented by the following formula [1]:
Re x MA a MB b MC c N d X e [1]
wherein in formula [1], MA includes one or more elements selected from the group consisting of Sr, Ca, Ba, Na, K, Y, Gd, and La, MB includes one or more elements selected from the group consisting of Li, Mg, and Zn, MC includes one or more elements selected from the group consisting of Al, Si, Ga, In, and Sc, X includes one or more elements selected from the group consisting of F, Cl, Br, and I, Re includes one or more elements selected from the group consisting of Eu, Ce, Pr, Tb, and Dy, and a, b, c, d, e, and x respectively satisfy the following expressions:
0.7
≤
a
≤
1.3
0.7
≤
b
≤
1.3
2.4
≤
c
≤
3.6
3.2
≤
d
≤
4.8
0.
≤
e
≤
0.2
0.
<
x
≤
0.2
.
10 . The light-emitting device according to claim 1 , wherein the red phosphor comprises at least a phosphor containing a crystal phase having a composition represented by the following formula [2]:
Re x MA a MB b (MC′ 1-y MD y ) c N d X e [2]
wherein in formula [2], MA includes one or more elements selected from the group consisting of Sr, Ca, Ba, Na, K, Y, Gd, and La, MB includes one or more elements selected from the group consisting of Li, Mg, and Zn, MC′ is Al, MD includes one or more elements selected from the group consisting of Si, Ga, In, and Sc, X includes one or more elements selected from the group consisting of F, Cl, Br, and I, Re includes one or more elements selected from the group consisting of Eu, Ce, Pr, Tb, and Dy, and a, b, c, d, e, x, and y respectively satisfy the following expressions:
0.7
≤
a
≤
1.3
0.7
≤
b
≤
1.3
2.4
≤
c
≤
3.6
3.2
≤
d
≤
4.8
0.
≤
e
≤
0.2
0.
<
x
≤
0.2
0.
<
y
≤
1.
.
11 . The light-emitting device according to claim 1 , wherein the red phosphor comprises at least a phosphor containing a crystal phase having a composition represented by the following formula [3]:
Re x MA a MB b MC c (N,O) d X e [3]
wherein in formula [3], (N,O) means containing N and O, MA includes one or more elements selected from the group consisting of Sr, Ca, Ba, Na, K, Y, Gd, and La, MB includes one or more elements selected from the group consisting of Li, Mg, and Zn, MC includes one or more elements selected from the group consisting of Al, Si, Ga, In, and Sc, X includes one or more elements selected from the group consisting of F, Cl, Br, and I, Re includes one or more elements selected from the group consisting of Eu, Ce, Pr, Tb, and Dy, and a, b, c, d, e, and x respectively satisfy the following expressions:
0.7
≤
a
≤
1.3
0.7
≤
b
≤
1.3
2.4
≤
c
≤
3.6
3.2
≤
d
≤
4.8
0.
≤
e
≤
0.2
0.
<
x
≤
0.2
.
12 . The light-emitting device according to claim 1 , wherein the red phosphor comprises at least a phosphor containing a crystal phase having a composition represented by the following formula [4]:
Re x MA a MB b (MC′ 1-y MD y ) c (N,O) d X e [4]
wherein in formula [4], (N,O) means containing N and O, MA includes one or more elements selected from the group consisting of Sr, Ca, Ba, Na, K, Y, Gd, and La, MB includes one or more elements selected from the group consisting of Li, Mg, and Zn, MC′ is Al, MD includes one or more elements selected from the group consisting of Si, Ga, In, and Sc, X includes one or more elements selected from the group consisting of F, Cl, Br, and I, Re includes one or more elements selected from the group consisting of Eu, Ce, Pr, Tb, and Dy, and a, b, c, d, e, x, and y respectively satisfy the following expressions:
0.7
≤
a
≤
1.3
0.7
≤
b
≤
1.3
2.4
≤
c
≤
3.6
3.2
≤
d
≤
4.8
0.
≤
e
≤
0.2
0.
<
x
≤
0.2
0.
<
y
≤
1.
.
13 . The light-emitting device according to claim 1 , wherein the second luminescent material further comprises a yellow phosphor and/or a green phosphor.
14 . The light-emitting device according to claim 13 , wherein the yellow phosphor and/or the green phosphor comprises any one or more of a garnet type phosphor, a silicate type phosphor, a nitride phosphor, and an oxynitride phosphor.
15 . An illumination device comprising the light-emitting device according to claim 1 as a light source.
16 . An image display device comprising the light-emitting device according to claim 1 as a light source.Join the waitlist — get patent alerts
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